Steel retainer



J. F. MOCK STEEL RETAINER Filed April 7. 1927 MW U 1; W Q M M J J 2217M Jr- H/S ATTO'R EY v Patented Apr. 17, 1928.

UNITED STATES PATENT OFFICE.

JOHN F. MOGK, OF PHILLIPSBURG, NEW JERSEY, ASSIGNOR TO INGERSOLL-RAND COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

STEEL RETAINER.

Application filed April 7,

This invention relates to rock drills, but more particularly to steel retainers for rock drills of the hammer type.

The objects of the invention are to prevent ejection of the working implement from the drill and to enable the retainer to be quickly attached to the drill and removed therefrom.

Other objects will appear hereinafter, and to all of these ends the invention consists of the combination of elements and arrangement of parts having the general mode of operation substantially as hereinafter described and claimed and illustrated in the accompanying drawings, in which Figure 1 is a vertical sectional view of a front end of a rock drill having the invention applied thereto,

Figure 2 is a vertical broken away, and

Figure 3 is a view of the front end of the drill.

Referring more particularly to the drawings, A designates a cylinder, only a portion side view partly of which is shown. A front cylinder washer B forms a closure for the front end of the cylinder and is bored to receive slidably a piston C reciprocable in the cylinder A. At the front end of the cylinder A is disposed a front head D having lugs E through which extend side bolts F whereby the front head may be secured to the cylinder.

The front head D is preferably provided with a bushing E having a rearward cylindrical bore F and a forward bore Gr. The

bore G may be of any suitable form to receive the shank of a working implement H.

The working implement H in this instance has a collar J which cooperates with the front end of the bushing E to limit the distance which the shank of the working implement may extend into the bore Gr. An additional function of the collar J is to prevent ejection of the implement H from the front head, as will be described more fully hereinafter.

Near the front end of the front head D and at one side thereof is formed a lug K having a longitudinal slot L which opens into a transverse slot 0 alsoin the lug K. The slot L is intended to act as a guide for an arm P of a retainer Q. The retainer Q in this instance is disposed at an angle to the arm P and has an aperture R to receive the 1927. Serial No. 181,732.

working implement H. The aperture R in this instance comprises an enlarged portion S and a portion T of smaller area. The portlon T of the aperture R is preferably only of such area as to permit the implement H to reciprocate freely therethrough.

The means for pivoting the retainer Q to the front head of the drill'consists in this instance of a pin U which extends through the free end of the arm P and is adapted to lie in the transverse slot 0 in which it may reciprocate longitudinally of the front head. Suitable means are provided for cushioning the impact of the working implement against the retainer Q. To that end the lug K is provided with apertures V on opposite sides of the slot L to act as guides for plungers WV held against the pin U by means of springs X guided by the apertures V.

In order to prevent the retainer Q from rocking out of retaining position, or out of releasing position during the time the drill steel is being changed, the front head D is provided with a lug Y located rearwardly of the lug K and having an aperture Z for the reception of a plunger 6 adapted to bear against end surfaces 0 and d of the arm P. A spring 8 elso disposed in the aperture Z acts on the plunger 6 to force the said plunger firmly against the surfaces 0 and d. By inclining the surface 0 from the surface d the plunger 5 may seat flatly on the surface 0 for holding the retainer in releasing position.

During the operation of the drill, the re tainer Q will normally beheld in the retaining position by the plunger 1) acting against the surface cl. In this position of the retainer, whenever the working implement H is suddenly driven forwardly, the collar J may strike against the retainer Q and in this way the implement H is held against ejection from the drill. Whenever it is desired to change the working implement, the retainer Q may be rocked to the releasing position illustrated in dot and dash lines, thus moving the enlarged portion S of the aperture E into the path of the collar J and, since this portion of the aperture is of greater diameter than the collar J, the implement H may be freely withdrawn from the drill and another implement substituted therefor. After the insertion of another implement, the retainer Q may again be tudinal slot and a transverse slot, a retainer 10 forming a stop for the implement forwardly of the collar of said implement, an arm on wthe retainer guided by thelongitudinal slot,-

r a pin in the end of the armrotatable in the .wtransverse slot, said pin also being slidable.- 1:7 ina'the slot longitudinally of the front head means including springs and plungers'in the; lugto cushion the impact of'theiimplement a*againstthe retainer, and a spring pressed plunger inthe front head acting against the an end ofxthe arm to hold the retainer in rei :itaining andreleasing positions. a

' 2. A steel retainer for a rock drill,- comprising in combination With a front head and a collared Working implement, a lug on the side of the front head having a longitudinal slot and a transverse slot, a retainer "encircling the implement forwardly of its collar to retain said implement in the front head, one arm integral with the retainer guided by the longitudinal slot, a pin in the arm rotatable inthe transverse slot to form a pivot for the retainer, said pin also being slidable in said atransverse slot longitudinally of :the front-head,.plungers in the lug acting on the pin tosupport the retainer, springsacting against the plungers to absorb the impact of the implement against the retainerpand a spring pressed plunger in the front head pressing against the free end of the arm to hold the retainer in retaining and releasingpositions.

:In testimony whereof Iha esigned this specification;

-' JOHN F. MOCK. 

